Red azo dyestuffs and process of making same.



THE MAIN, GERMANY, AssIeNoR-s T0 .xnuensr iH R, or NIED-on-rHn-MAIN, ANDCARL osKAn MTJ'LLER, or noonsr-on- FARBXVERKE- VORM. MEISTER LUCIUS &

ism'i nme or HoCHS ON-THELMMN, GERMANY, A CORPORATION or GERMANY.

3E1) Azo DYESTUFFS AND PROCESS or MAKING SAME.

No Drawing.

To aZZwhom it may concern: v

Be it known that we, AUGUST LUTHER,

Ph. D.,' Chemist, and CAM 'OsKAR Mii LLER,

Ph D, chemist, citizens of theEmpire of .Russia and the Empire ofGermany, respectively, residing at Nied on-the-Main, Germany, andHochst-on-theMain, Germdny, respectively, have invented certain new anduseful Improvements in Red Azo Dyestuffs and Processes of Making Same,of which the following is a specification.-

n U. S. Patent No. 888837 are described Specification of Letters Patent.Application filed 11115 15,. 19x2. Serial No. 709,541.

dyestuffs of the general constitution: diazo They form greenish powders,readily soluble in hot water and concentrated sulfuric 1 acid with a redcolor, diflicultly soluble in alcohol, dyeing unmordanted cotton redtints.

nitrite are dissolved. There are then added- It readily dissolvesin hotwater to a red solution and dyes unm'ordanted'cotton beant-ifulred,-tints.' Bydevelo'ping the dyeings with -naphth0l, bright-red-tmtsare obtained.

Patented July 11,1913.

compound p aminobenzoyl 2.5.7 aminona-phthol sulfonic acid pamiobenzoyl- 2.5.7-aininonaphtholsulfonic acid, Now we have found thatred disazo dyestuffs of great value may also be obtained by substitutingin the disazo dyestuffs, obtained according to U. S. Patent No. 888837,for one molecule.

of the p-aminbbenzoyl-2.SQZ-aminonaphtholsulfonic acid, one molecule ofthe p-aminobenzoyl 3.5.7 aminonaphtholsulfonic acid. The dvestufi's thusobtained correspond to the formula:

Noel V l 35 fkilosof hydrochloric acid of 30% strength, so that thetemperature rises to 1S-20 C. The whole is then. stirred at thistemperature for one hour and the dime compound thus obtained is run intoa solution of tO kilos of p-aminobenzoyl-2.5.7; amino-.nap'rlitholsulfonic acidand kilos of sodium carbonate. After havingstirred the Whole for about 24: hours, the formation of the dyestutf iscomplete, whereupon .it is salted out, filterech pressed and dried. The'dyestutf thus obtained has the formula:

80 B 1 Nl CO- Having now described our inventiongivhat we claim 1s:

l. The process of manufacturing new 'azo dyestuffs, which consists infurther diazotizing the dyestuif obtained by combining] a diazo compoundwith para-aminobenzoylpara-aminohenzoyl-2.5.7-aniinonaphtholsulv L Ifonic acid. 5' 3.5.i?-am1nonaphtholsu1ton1c acid, and com- 2 AS newproducts, the am dyestuffs of bining it with one molecular proportion ofthe general constitution:-

' song/W son; Nnco- -NH2 -1 Aryl-N=N -NHCO- -N'-=N- k/\ 1 d on being ina solid state a green powder, cultly solublein alcohol, dyeingunmord'anty 4 ed cotton red tints.

-read. QLl m hot water and concen- 3. As a new product, the am dyestutfof 10 trated sulfuric acid with a red color, difllthe constitution:

S0 H l/ I s0,H /\i/ N-nco- NHQ CHr N=N NHco-- \--N==N- I i H on .415being in a solid state a green powder, read- In testimony whereof," weaflix our signaily soluble in hot water and concentrated Yes i jf gggtsuIfurioacid 'ivith a red color, difficultly solj CARL OSKAR MljLLER.

' Witnesses:

JEAN GRUND Zuble in alcohol, dyeing unmordanted cotton tints. e CARLGRUND.

